The Tower of London offers enough to keep you captivated for a good three to four hours. The Tower of London is the city’s best-known and oldest historic site.

There is an architecture to the Tower, and it is not
uninteresting. Within the complex as a whole,
the 27 m tall White Tower is the central feature that
remains substantially as it was in when completed,
as the conquering sovereign’s forbidding foothold in
the eastern boundary of the City – a dominant place
from which he could oversee the City’s cowering and
unfriendly inhabitants. The Tower remained an imposing
place of imprisonment and executions until World War II
although, officially, it was still a royal residence. Inside,
residential conveniences included the St John’s Chapel:
a small Norman space of distinctly massive charm and
it was not until the reign of Henry VIII (1509-47) that the
sovereign moved to Westminster Palace and St James’
Palace, in the west.

The entrance to the Tower is on the west side – at the
Middle and Byward towers (adjacent to a Norman Foster
building), along a stone causeway that replaces the
original drawbridge. The Byward Tower acquired halftimbered
parts during the reign of Richard II (1377-1399),
but what you see now is the later restorations which
paralleled rising tourist interest in the place.

The fortress was completed in stages, mostly between
1066 and 1307, beginning with the so-called White
Tower, completed in 1080, which replaced a timber fort
built by William the Conqueror, it was "white" because
it was constructed from creamy-coloured Caen stone
brought over from France. However, the White Tower
as we see it now is partly the product of restorative
work by Wren, between 1663 and 1709 (he altered all
the windows, for example). Not long after, certainly by
1750, the Tower was being opened to the public as an
historical attraction. Anthony Salvin undertook further
restoration work in 1851. And he was succeeded, in
1870, by the 'medievalising' John Taylor.

The outcome of it all is an overlay of architectures: a
medieval one as a fortress; a more theatrical one of
restoration, of mixed qualities; a tourist one of attractions
that now includes Stanton Williams’ fine approach work
on the west side (2004; ticket office, cafes, etc.); and one
of inhabitation (in the north-east corner, where yeoman
warders and their families live). It is remarkable both
to experience this set of overlays as one architectonic
whole, and also to stand at the nearby vantage point
of Tower Hill and look around: at nearly two thousand
years of London history, from fragments of medieval
walls on Roman foundations next to the Underground
station, across to the Tower, beyond to the Mayor’s City
Hall (Foster again), Canary Wharf, and behind to the old
Port of London Authority building, Lloyds.